Reduce zone segment pool size on all devices to 8kb

src/zone/accounting-allocator.h

Index: src/zone/accounting-allocator.h
diff --git a/src/zone/accounting-allocator.h b/src/zone/accounting-allocator.h
index 70661cebe8e31075e76271d40a4a07a1ec70c69c..c6bf7a75e3c8ff47b1b4cfcf6783f8226ceab752 100644
--- a/src/zone/accounting-allocator.h
+++ b/src/zone/accounting-allocator.h
@@ -21,9 +21,9 @@ namespace internal {
 class V8_EXPORT_PRIVATE AccountingAllocator {
  public:
   static const size_t kMaxPoolSizeLowMemoryDevice = 8ul * KB;
-  static const size_t kMaxPoolSizeMediumMemoryDevice = 1ul * MB;
-  static const size_t kMaxPoolSizeHighMemoryDevice = 2ul * MB;
-  static const size_t kMaxPoolSizeHugeMemoryDevice = 3ul * MB;
+  static const size_t kMaxPoolSizeMediumMemoryDevice = 8ul * KB;
+  static const size_t kMaxPoolSizeHighMemoryDevice = 8ul * KB;
+  static const size_t kMaxPoolSizeHugeMemoryDevice = 8ul * KB;
 
   AccountingAllocator();
   virtual ~AccountingAllocator();